public class Example {
   public static void main(String args[]) {
      ChinaPeople chinaPeople=new ChinaPeople();
      AmericanPeople americanPeople=new AmericanPeople();
      BeijingPeople beijingPeople=new BeijingPeople();
      chinaPeople.speakHello();
      americanPeople.speakHello();
      beijingPeople.speakHello();
      chinaPeople.averageHeight();
      americanPeople.averageHeight();
      beijingPeople.averageHeight();
      chinaPeople.averageWeight();
      americanPeople.averageWeight();
      beijingPeople.averageWeight();
      chinaPeople.chinaGongfu();
      americanPeople.americanBoxing();
      beijingPeople.beijingOpera() ;
      beijingPeople.chinaGongfu();
   }  
}
